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Novas, F.E.; Puerta, P.F. (1997). „New evidence concerning avian origins from the Late Cretaceous of Patagonia”. Nature387 (6631): 390–2. Bibcode1997Natur.387..390N. DOI:10.1038/387390a0.
Senter, P. (2006). "Scapular orientation in theropods and basal birds, and the origin of flapping flight." Acta Palaeontologica Polonica, 51(2): 305–313.PDF fulltext